epan/crc8-tvb.h

   1 /** @file
   2  *
   3  * Checks the checksum (FCS) of the 3G TS 27.010 Multiplexing protocol.
   4  * The algorithm to check the FCS is described in "3G TS 27.010 V2.0.0 (1999-06)"
   5  * See: www.3gpp.org/ftp/tsg_t/TSG_T/TSGT_04/docs/PDFs/TP-99119.pdf
   6  * or: http://www.3gpp.org/ftp/Specs/html-info/27010.htm
   7  *
   8  * Polynom: (x^8 + x^2 + x^1 + 1)
   9  *
  10  * 2011 Hans-Christoph Schemmel <hans-christoph.schemmel[AT]cinterion.com>
  11  * 2014 Philip Rosenberg-Watt <p.rosenberg-watt[at]cablelabs.com>
  12  *  + Added CRC-8 for IEEE 802.3 EPON, with shift register initialized to 0x00
  13  *    See IEEE Std 802.3-2012 Section 5, Clause 65.1.3.2.3.
  14  *
  15  * Wireshark - Network traffic analyzer
  16  * By Gerald Combs <gerald@wireshark.org>
  17  * Copyright 1998 Gerald Combs
  18  *
  19  * SPDX-License-Identifier: GPL-2.0-or-later
  20  */
  21
  22
  23 /**
  24  * Check the final crc value(Receiver code)
  25  *
  26  * \param p The tv buffer containing the data.
  27  * \param len Number of bytes in the message.
  28  * \param offset Offset in the message.
  29  * \param received_fcs The received FCS.
  30  * \return     Returns true if the checksum is correct, false if it is not correct
  31  *****************************************************************************/
  32
  33 #ifndef __CRC8_TVB_H__
  34 #define __CRC8_TVB_H__
  35
  36 extern bool check_fcs(tvbuff_t *p, uint8_t len, uint8_t offset, uint8_t received_fcs);
  37 extern uint8_t get_crc8_ieee8023_epon(tvbuff_t *p, uint8_t len, uint8_t offset);
  38
  39 #endif /* __CRC8_TVB_H__ */